A Comprehensive Analysis of the 2004 Model Year

Learn about the reliability of the 2004 Ford Mustang, a iconic American muscle car. Our expert analysis covers the engine, transmission, electrical systems, and more to help you make an informed decis …

Updated June 6, 2023

The 2004 Ford Mustang is a significant model year for the pony car, as it marked the return of the classic design after a brief hiatus in 2003. But how reliable are these ‘04 Mustangs? Let’s dive into the details.

Engine Reliability

The 2004 Ford Mustang comes with two engine options: a 4.6-liter V8 and a 3.9-liter V6. The V8 engine, specifically designed for high-performance applications, has a reputation for being robust and reliable. However, some owners have reported issues with the engine’s timing chain and tensioner.

Timing Chain Issues: Some 2004 Mustangs have been known to experience timing chain problems, which can lead to premature wear on the engine’s valves and cylinder head. If left unchecked, this issue can result in costly repairs.
Oil Leaks: A small number of ‘04 Mustangs have been reported to have oil leaks from the valve cover gasket or other engine components.

Transmission Reliability

The 2004 Ford Mustang features a four-speed automatic transmission (4R70W) or a five-speed manual transmission. The majority of owners have reported reliable performance from both transmissions, but some issues have arisen:

Transmission Slipping: A few ‘04 Mustangs have experienced transmission slipping, especially when accelerating from a standstill.
Torque Converter Problems: Some automatic-equipped vehicles have had issues with the torque converter, leading to hesitation or slipping.

Electrical System Reliability

The 2004 Ford Mustang’s electrical system is generally reliable, but some owners have reported issues with:

Faulty Ignition Coils: A small number of ‘04 Mustangs have experienced faulty ignition coils, which can cause poor engine performance and decreased fuel efficiency.
Erratic Wipers: Some vehicles have been known to experience erratic windshield wiper behavior, often caused by a faulty module or wiring issue.

Other Reliability Concerns

In addition to the above issues, some 2004 Ford Mustang owners have reported problems with:

Faulty Oxygen Sensors: A few ‘04 Mustangs have experienced faulty oxygen sensors, which can lead to decreased fuel efficiency and engine performance.
Rust Issues: Some vehicles have been known to experience rust in areas such as the frame, floor pans, and trunk lid.

Conclusion

While the 2004 Ford Mustang has its share of reliability concerns, it’s essential to remember that many owners have reported trouble-free ownership experiences. If you’re considering purchasing a 2004 Mustang, be sure to:

Check Maintenance Records: Review the vehicle’s maintenance records to ensure regular servicing and timely repairs.
Get a Vehicle Inspection: Have a qualified mechanic inspect the vehicle for any potential issues or needed repairs.
Research and Compare Prices: Research and compare prices from various sellers to find a fair deal.

By being aware of these reliability concerns, you can make an informed decision when purchasing a 2004 Ford Mustang.